Interzone Routing
Large Site - Intermediate Solutions
Division
Zone Enterprise
T-3
Zone Intermediate
Intermediate
Gatekeeper
controlling
Intermediate Zone
Enterprise
Gatekeeper
controlling
Enterprise Zone
PSTN
Remainder of the
Corporate Network
Large Site - Enterprise Solutions
Division
T1
T1
Uses
8-322-xxxx
dialing
Uses
8-224-xxxx
dialing
Enterprise Gatekeeper
routes 8-322 calls to
Intermediate
Gatekeeper
Intermediate
Gatekeeper routes
8-224 calls to Enterprise
Gatekeeper
The company has implemented a dial plan where you dial a “9” to get an
outside line. For calls within the company, you use an “8” followed by seven
digits.The Enterprise group uses the 224-xxxx exchange, while the Intermediate
www.syngress.com
Figure 5.5 Interzone Routing
Large Site - Intermediate Solutions
Division
Zone Enterprise
T-3
Zone Intermediate
Intermediate
Gatekeeper
controlling
Intermediate Zone
Enterprise
Gatekeeper
controlling
Enterprise Zone
PSTN
Remainder of the
Corporate Network
Large Site - Enterprise Solutions
Division
T1
T1
Uses
8-322-xxxx
dialing
Uses
8-224-xxxx
dialing
Enterprise Gatekeeper
routes 8-322 calls to
Intermediate
Gatekeeper
Intermediate
Gatekeeper routes
8-224 calls to Enterprise
Gatekeeper
Voice and Video Gatekeeper Design • Chapter 5 151
group uses the 322-xxxx exchange.These patterns will be used within the gatekeepers
for routing calls between zones. Here is how you would configure each
gatekeeper.
For the Enterprise Gatekeeper:
zone local enterprise company.com
zone remote intermediate company.com 172.16.128.1
zone prefix enterprise 8224....
zone prefix intermediate 8322....
For the Intermediate Gatekeeper:
zone local intermediate company.com
zone remote enterprise company.com 172.16.192.1
zone prefix intermediate 8322....
zone prefix enterprise 8224....